<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!--提示区域  -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤图区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="商品完成"></el-step>
      </el-steps>

      <!-- 添加商品的表单 -->
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="80px"
        label-position="top"
      >
        <!-- tab栏区域 -->
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          @tab-click="tabClick"
          :before-leave="beforTabLeave"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                :options="cateList"
                v-model="addForm.goods_cat"
                :props="cateProps"
                @change="handleCateChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <el-checkbox-group @change="cbClick" v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  :key="i"
                  v-for="(cb, i) in item.attr_vals"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadPath"
              :headers="headerInfo"
              :on-preview="handlePreview"
              :on-success="handleSuccess"
              :on-remove="handleRemove"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor
              ref="myQuillEditor"
              v-model="addForm.goods_introduce"
            />
            <el-button type="primary" class="btnAdd" @click="addGood"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" width="100%" alt="" />
    </el-dialog>
  </div>
</template>

<script>
// Lodash是一个著名的javascript原生库,
//不需要引入其他第三方依赖。是一个意在提高开发者效率,提高JS原生方法性能的JS库
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      //添加商品的表单
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        //商品的动静参数
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }

        ]
      },
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [],
      onlyTableData: [],
      uploadPath: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerInfo: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false

    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },

  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }

      this.cateList = res.data
      // console.log(this.cateList);
    },

    // 级联选择器选中项变化，会触发这个函数
    handleCateChange() {
      if (this.addForm.goods_cat.length != 3) {
        return this.addForm.goods_cat = []
      }
      // console.log(this.addForm.goods_cat);
    },
    //切换标签之前触发的函数
    beforTabLeave(activeName, oldActiveName) {
      // console.log(activeName, oldActiveName);
      if (oldActiveName === '0' &&
        this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // 点击标签触发的函数
    async tabClick() {
      // console.log(this.activeIndex);
      //证明访问的是动态参数 
      if (this.activeIndex == '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'many'
            }
          })
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数失败！")
        }
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
        // console.log(this.manyTableData);
      }
      if (this.activeIndex == '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'only'
            }
          })
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性失败！")
        }
        this.onlyTableData = res.data
        // console.log(this.onlyTableData) 
      }
    },
    cbClick() {
      console.log(this.manyTableData);
    },
    //处理图片预览效果
    handlePreview(file) {
      // console.log(file);
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      // console.log(file);
      // 1．获取将要删除的图片的临时路径
      const tmp_path = file.response.data.tmp_path
      //2．从 pics数组中，找到这个图片对应的索引值
      let i = this.addForm.pics.findIndex((item) => {
        return item.pic === tmp_path
      })
      // console.log(i);
      //3．调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm.pics);
    },
    //上传成功后，触发的钩子函数
    handleSuccess(response) {
      // console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 2．将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm.pics);
    },
    // 添加商品的事件
    addGood() {
      console.log(this.addForm);
      this.$refs.addFormRef.validate(
        async valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项')
          }
          // 执行添加的逻辑
          //深拷贝
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // v-model双向绑定  数据改变类型 级联选择器报错
          // this.addForm.goods_cat = this.addForm.goods_cat.join(',')

          // 处理动态参数
          this.manyTableData.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(',')
            }
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableData.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form);
          //发起请求添加商品
          //商品的名称，必须是唯一的
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        }
      )
    }
  }
}
</script>

<style lang="less" scoped>
.btnAdd {
  margin-top: 15px;
}
</style>